Personalized Don't Tread On Me T-Shirt. Don't Tread On Me. The Gadsden flag, with coiled rattlesnake, symbol of American independence. Great gift for anyone who loves freedom. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.